Calendar-watch

ABSTRACT

A calender watch movement comprises day and date indicators respectively having rings of teeth, a single jumper with two pawls respectively engaging said rings of teeth, and return spring means biasing said jumper to engage said pawls with said rings of teeth, said jumper comprising two parts, each carrying one of the pawls, which are relatively adjustable to assure the exact angular positions of said pawls.

United States Patent Vogt et al. 1 Jan. 30, 1973 f C lj ilffi f flfgf FOREIGN PATENTS OR APPLICATIONS [75] Inventors: Kurt v03, Bieme; Wand 367 760 4/1963 Switzerland ..5s/5s Orpund, both of Switzerland 290,654 5 1953 Switzerland ..5 8/58 [73] Assignee: OMEGA Louis Brandt & Frere S. A.,Bienne, Bern, Switzerland [22] Filed: June 14,1971

[21] Appl. No.2 152,804 I [30] Foreign Application Priority Data June 30, 1970 Switzerland ..9862/70 [52] U.S. Cl ..58/58 [51] Int. Cl. ..G04b 19/24 [58] Field of Search ..58/4, 5, 58, 59

[56] References Cited UNITED STATES PATENTS 3,45l,2ll 6/1969 Nakagawa 58/58 Primary ExaminerGeorge H. Miller, Jr. Attorney-Imirie & Smiley [57] ABSTRACT A calender watch movement comprises day and date indicators respectively having rings of teeth, a single jumper with two pawls respectively engaging said rings of teeth, and return spring means biasing said jumper to engage said pawls with said rings of teeth, said jumper comprising two parts, each carrying one of the pawls, which are relatively adjustable to assure the exact angular positions of said pawls.

4 Claims, 1 Drawing Figure PATENTEUJAN30 I973 INVENTORS .n t F. A v v MM 0 R M an 0A M 0 RN. m K0 R CALENDAR-WATCH BACKGROUND OF THE INVENTION Calender watches usually comprise day and date indicators which respectively are positioned by spring biased jumpers having pawls engaging the indicator teeth. The indicators are advanced one tooth every 24 hours by the watch movement which is subject to heavy power demands to overcome the reaction of the'jumper springs. Also, the teeth and the pawls must be produced and positioned with extreme accuracy to function properly.

SUMMARY OF THE INVENTION According to the present invention, a calendar watch movement comprising a day and a date indicator, wherein one of the indicators may have internal teeth and the other external teeth, both being stepwise driven at intervals of 24 hours by the watch movement. The movement comprises a single jumper biased by return spring means, said jumper having two angularly adjustable parts, each carrying a pawl engaging respectively the teeth of the date indicator and the teeth of the day indicator, to assure their exact angular positions, and means for adjusting the angular relation between said parts. The adjusting means preferably comprises an eccentric pivotally mounted on one part and straddled by spaced arms on the other of said parts.

BRIEF DESCRIPTION OF THE DRAWING The single FIGURE is a plan view of a preferred embodiment of the calendar watch movement in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION The calendar watch movement, shown in the drawing includes a date indicator which'comprises a disc 1 having 31 internal teeth 2. The disc 1 is provided on its upper face with numerals sequentially corresponding in number to the respective teeth; not illustrated, which are located to appear in an aperture in the watch dial in the usual manner. The watch movement includes a day indicator 3 which comprises a star wheel having fourteen external teeth 4. The star wheel 3 is rigidly connected to a disc, not shown, and on which appear two series of names of the days of a week (MON, TUE, etc.) which also appears in an aperture in the watch dial in the usual manner. It is advantageous if both indications appear in the same aperture. Indicators 1 and 3 of this type are well known per se in the art.

A well-known mechanism, not shown, which is operated by the watch movement, more particularly by the hour wheel, moves the indicators 1 and 3 at intervals of 24 hours in stepwise fashion, either abruptly or gradually.

A single jumper 5 is pivotably mounted on a pin 6 carried by the watch frame not shown. The jumper 5 is constituted by two parts 50 and 5b, both pivotal on the pin 6. An adjusting means, preferably on eccentric 7, having a shank and a slotted head, has its shank friction-fitted into the part 5a and its slotted head engaged between bifurcations of spaced arms 8 of the part 5b. By turning the eccentric 7 in one or the other direction, it is possible to vary the relative angular position of the BartsSa and 5b. The part 5a has at its force end a pawl which engages the teeth 2 of the date indicator 1. The

part 5b has a pawl 10 which engages the teeth 4 of the day indicator 3. A return spring 11 fixed on the watch frame bears laterally against part 5a and urges the pawls 9 and 10 toward the teeth 2 and 4 of the indicators 1 and 3, respectively. The adjustment effected by the eccentric 7 regulates the depth of engagement of the pawls 9 and 10 between the respective teeth, thereby compensating for tolerances of manufacturing. The jumper 5 assures a correct angular position of the indicators 1 and 3, favorable to a proper function of the calendar.

The necessary power for operating a calendar device, being normally quite high, may thus be reduced by using a single return spring, this being the consequence of using a single jumper for both indicators. In this way the resistance to be overcome when the indicators jump, is also reduced.

What we claim is:

l. A calendar watch movement comprising:

a rotatably mounted day indicator having a ring of teeth;

a rotatably mounted date indicator having a ring of teeth;

a pivotably mounted jumper carrying two pawls respectively engaged with said rings of teeth; spring means biasing said jumper to engage said pawls respectively with said rings of teeth, and

said jumper comprising two angularly adjustable parts, each carrying one of said pawls, and means engaged between said parts for adjusting their angular relation to regulate the depth of engagement of said pawls between the teeth of said rings.

2. A movement according to claim 1 wherein the ring of teeth on one said indicator comprises internal teeth;

said indicators being disposed concentrically with the ring of internal teeth spaced outwardly of the ring of external teeth, and

said jumper being disposed between said rings of teeth.

3. A movement according to claim 1 wherein said means comprises an eccentric.

4. A movement according to claim 3 wherein said eccentric is pivotally mounted on one of said parts, and

said means also comprises bifurcations on the other of said parts and straddling said eccentric.

II i l 

1. A calendar watch movement comprising: a rotatably mounted day indicator having a ring of teeth; a rotatably mounted date indicator having a ring of teeth; a pivotably mounted jumper carrying two pawls respectively engaged with said rings of teeth; spring means biasing said jumper to engage said pawls respectively with said rings of teeth, and said jumper comprising two angularly adjustable parts, each carrying one of said pawls, and means engaged between said parts for adjusting their angular relation to regulate the depth of engagement of said pawls between the teeth of said rings.
 1. A calendar watch movement comprising: a rotatably mounted day indicator having a ring of teeth; a rotatably mounted date indicator having a ring of teeth; a pivotably mounted jumper carrying two pawls respectively engaged with said rings of teeth; spring means biasing said jumper to engage said pawls respectively with said rings of teeth, and said jumper comprising two angularly adjustable parts, each carrying one of said pawls, and means engaged between said parts for adjusting their angular relation to regulate the depth of engagement of said pawls between the teeth of said rings.
 2. A movement according to claim 1 wherein the ring of teeth on one said indicator comprises internal teeth; said indicators being disposed concentrically with the ring of internal teeth spaced outwardly of the ring of external teeth, and said jumper being disposed between said rings of teeth.
 3. A movement according to claim 1 wherein said means comprises an eccentric. 